Salesforce Reports and Dashboards consist of two components: Data (the runtime query result, accessible via the SOAP API) and Metadata (the report/dashboard definition, managed via the Metadata API). Because they contain metadata, deleted reports and dashboards behave differently from standard records when placed in the Recycle Bin. If a report or dashboard is deleted, it is moved to the Recycle Bin where it can be restored for up to 15 days.
Data (read only):
Metadata:
If a dashboard or report is deleted it's placed into the Recycle Bin for 15 days, where it's possible to restore them. To view and manage the Recycle Bin in Salesforce Classic, see this Help page. To view and manage the Recycle Bin in Lightning, review this Help page.
However, once a dashboard or report has been emptied from the recycle bin or hard deleted it's not possible to restore or undelete it and there's no way for customers or Support to recover it.
Unfortunately, not even a data recovery service would be applicable for deleted reports and dashboards since they are partially comprised of metadata which is excluded from the service.
Our best recommendation is to check to see if you have a recently refreshed Full or Partial sandbox that contains the report or dashboard. If so, you maybe able to use a change set to move it back to your production organization.
View and Purge the Recycle Bin
How to restore multiple records that are in recycle bin
Recover or restore lost or deleted records and data
Data Access and Views: What’s Different or Not Available in Lightning Experience
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